Planar coordinates are encoded using Row and Column
Abscissae (x-coordinates) are specified to the nearest 1
Ordinates (y-coordinates) are specified to the nearest 1
Planar coordinates are specified in meters

The horizontal datum used is D_WGS_1984.
The ellipsoid used is WGS_1984.
The semi-major axis of the ellipsoid used is 6378137.000000.
The flattening of the ellipsoid used is 1/298.257224.

Depth values are real values based on the average of the
soundings that fell within the extracted grid cells. The number of
soundings per grid cell range from >1000 soundings in shallow depths
to as few as 20 soundings in deeper areas. A total error budget for
this survey has not been developed. Therefore, the accuracy of depth
measurements should be considered to be within 1 meter.

These netCDF and ASCII grids were created using data gathered from multibeam soundings to document
the impact of a ship grounding on the benthic habitat, and for use as a planning and reference
document. Further data were collected to fill gaps in the existing bathymetry.
Refer to supplemental information for description of instrument and survey.

Multibeam swath files are acquired in the Generic Sensor Format (GSF) and
are edited on a swath by swath basis using SAIC's SABER editing software. The edited
swath files are then combined into a Pure File Magic (PFM) format
with a defined grid cell size (1 m) in SABER and area based
editing is performed. The edited PFM is then exported as X,Y,Z
data with a value at each grid node. The X,Y,Z data are then
gridded using nearneighbor, a Generic Mapping Tools (GMT)
algorithm that converts an ASCII or binary table to a netCDF grid
file format. NetCDF grids are then converted to an ArcGIS ASCII
file format using LINUX/UNIX commands in combination with GMT.
GMT is an open source collection of tools for manipulating
geographic data sets. Additional information about GMT can be
found at: <http://www.soest.hawaii.edu/gmt> and additional
information about the multibeam data processing is recorded in
the cruise metadata.

Data are collected for resource
management and research purposes and are tested for internal
consistency; however, no effort is made to compare these data to
external references or to other published data.

These data are not to be used for navigation purposes. Please acknowledge NOAA Pacific Islands Fisheries
Science Center, and the Joint Institute for Marine and
Atmospheric Research (JIMAR) University of Hawaii as the
sources of this information.

These data are not to be used for navigational purposes.
NOAA makes no warranty regarding these data, expressed or implied, nor
does the fact of distribution constitute such a warranty. NOAA cannot
assume liability for any damages caused by any errors or omissions in
these data, nor as a result of the failure of these data to function
on a particular system.

These data can be downloaded as either a 2-D binary netCDF raster
grid or an ArcGIS ASCII text file. The netCDF grid
is the default grid file format used by GMT (Generic Mapping
Tools), which created this file. More information can be located
at <http://www.soest.hawaii.edu/gmt/and><http://www.unidata.ucar.edu/software/netcdf/>. The Arc ASCII file,
for use in ESRI's (<http://www.esri.com>) GIS software, can be
converted to an Arc Raster Grid using ArcToolbox ASCII to Raster
conversion tool.
in format netCDF and Arc ASCII